Description Set of 2 6303-2RS sealed wheel bearings for gas and electric scooters. This bearing is also known as 6303RS. This is a widely used size bearing and it can be used in various applications. Made from chrome steel, these bearings can rotate up to 7,000 RPM. Each bearing has 2 rubber seals to protect the bearing from dust or any possible contamination. Bearings are pre-lubricated with grease. The 6303-2RS wheel bearing is an upgraded bearing to be used in place of the 6303ZZ wheel bearing. 6303-2RS bearings use rubber seals in place of metal shields for superior protection against dirt, dust, and grime, thereby increasing the lifespan of the bearings. 17mm inside diameter, 47mm outside diameter, 14mm thickness. Note that 1 set is required for each wheel. Specifications Diameter (Outer): 47 mm Diameter (Inner): 17 mm Width: 14 mm